Researchr is a web site for finding, collecting, sharing, and reviewing scientific publications, for researchers by researchers.
Sign up for an account to create a profile with publication list, tag and review your related work, and share bibliographies with your co-authors.
Mark Daley, Michael Domaratzki, Kai Salomaa. Orthogonal Concatenation: Language Equations and State Complexity. J. UCS, 16(5):653-675, 2010. [doi]